Nmr solenoidal coil for rf field homogeneity
AssigneeHitachi, Ltd.
InventorsHideki Tanaka, Tsuyoshi Wakuda
Life of this patent
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Abstract
An NMR signal acquisition device that can increase the magnetic field homogeneity in a high frequency magnetic field by one of the following. (a) Current paths each having a different inductance are provided to adjust the diversion ratio of the current, (b) A current path branch point is provided in an intermediate part of the winding of a solenoidal coil so that there are more current paths in the intermediate part of the winding than in the current paths connected to the feeding points at both ends, (c) The radiuses of current paths are adjusted, (d) Winding pitches in the axis direction are adjusted, (e) Current path widths are adjusted, and (f) The solenoidal coil has both positive direction current paths and negative direction current paths.
Claims6
A solenoidal coil for an NMR signal, said solenoidal coil being used for NMR measurement, wherein radiuses of current paths are made different according to a predetermined ratio.
A NMR signal acquisition device comprising:
- a static magnetic field generator;
- a static magnetic field homogeneity compensation unit;
- a gradient field generator;
- a solenoidal coil for an NMR signal, said solenoidal coil comprising:
- said solenoidal coil being used for NMR measurement, wherein radiuses of current paths are made different according to a predetermined ratio,
- a probe on which said solenoidal coil is mounted;
- and
- a control unit that sends a high frequency current to said solenoidal coil for a NMR signal for acquiring the NMR signal,
- wherein current density at a center portion of said solenoidal coil is smaller than current density at an end portion of said solenoidal coil in an axial direction of said solenoidal coil.
Dependencies are inferred from the claim text.